LUTRON DT-2235B

CONTACT TACHOMETER, Model : DT-2235B Range 0.5 to 19, 999 RPM Surface Speed ( m/ min.) : 0.05 to 1, 999.9 m/ min. Surface Speed ( ft/ min.) : 0.2 to 6, 560 ft/ min. Resolution RPM 0.1 RPM < 1, 000 RPM 1 RPM g1, 000 RPM Surface Speed 0.01 m/ mim. < 100 m/ min. 0.1 m/ min. g100 m/ min. 0.1 ft/ min. < 1000 ft/ min. 1 ft/ min. g1, 000 ft/ min. Display 5 digits, 10 mm ( 0.4 " ) LCD Accuracy ± ( 0.05% + 1 digit ) . Sampling Time 1 second ( 6 RPM ) . Time base Quartz crystal . Circuit Exclusive one-chip of micro LSI circuit. Battery 1.5 V AA ( UM-3) battery x 4 PCs. Operating temp. 0 to 50  ( 32 to 122 ) . Memory Last value, Max. value, Min. value. Size 208 x 72 x 37 mm ( 8.2 x 2.8 x 1.5 inch) . Weight 280g ( 0.62 LB) / including battery. Accessories Carrying case 1 PC RPM adapter ( CONE) 1 PC RPM adapter ( FUNNEL) 1 PC Surface speed test wheel 1 PC Operation manual 1 PC